Millstone-driver



UNrrao STATES PATENT Fries.

JOHN W. DONNEL, OF BEDFORD, ASSIGNOR. TO VINCENT CHAMBERS, OF MUSGATINE, IOWA.

MlLLSTONE-DRIVER.

SPECIFICATION forming part of Letters Patent No. 236,003, dated December 28, 1880.

Application filed August 14, 1880. (ModeL) To all whom it may concern:

Be it known that I, JOHN WV. DONNEL, of Bedford, in the county of Taylor and State of Iowa, have invented a new and Improved Millstone-Driver, of. which the following is aspecification.

The object of? this invention is to provide a self-adjusting driver for millstones, whereby the stone shall'be balanced on the top of the cock-head, and thereby adjust itself with a minimum of friction.

The invention consists in the combination of a yoke pivoted to the upper end of a millspindle so as to swing in a vertical plane, and

I 5 four levers arranged in pairs, one pair being pivoted to each side of the yoke and suspendin g another yoke, which serves to make all the levers move together. The levers pivoted to the pivotal yoke extend above the point of the mill-spindle and are provided with set-screws, which bear against the'bail at points lying in the same plane and in line with the point of the spindle.

Figure l is a side elevation of the device.

Fig. 2 is a "ertical section on line 00 m, Fig. 1.

Fig. 3 is a plan of the device with balancerynd removed. Fig. 4 is a side elevation of a modification of an upright lever.

Similar letters of reference indicate corre- 3o spondiug parts.

In the drawings, A represents a millstonespindle, and B the terminal cock-head.

0 represents the upper yoke, consisting of a rectangular frame set over the upper end of 3 5 the spindle A and pivoted thereto by the opposite set-screws, a a, so as to swing in one direction from side to side. I; b are washers set on said screws a a, under their heads, to hold said yoke G from end movement on said 40 screws on a.

D represents the lower yoke, a rectangular frame of about half the depth of the yoke G.

From the ends of both the yokes D studs 0 01 project through mortises in the side pieces 5 of said yokes O D, and on the projecting ends of these studs 0d are pivoted the four upright levers E E, two at each side of the said yokes O D, and are held in place by pins ff passing through the studs 0 d.

F is the bail or balance-rynd, which rests upon the point of the spindle between setscrews 9-9 in the upper ends of the levers E E. The points of these screws bear against the downwardly-sloping arms of said bail or balancc-rynd F, on a plane with the top of the cock-head B,so that the diagonally-opposite screws, g, are pivotal as well as spindle-points of the runner-stone, and the two screws 9 are pivotal points, which serve to take upthe backlash of the stone, said stone being designed to rotate in the direction of the arrow shown in Fig. 3.

This device is self adjusting, permitting the balance-rynd F, and consequently the runnerstone in which the said balance-rynd F is fixed, to adjust itself above the bed-stone.

The movement of the levers E E prevents the grain from choking the eye of the runnerstone. The device being entirely pivotal permits of the free motion of the stone in all directions excepting in the plane of rotation, and affords a certain means of obtaining adriving-balance on any runner, and by its use a superior flour and greater yield are obtained.

In Fig. 4 is shown an upright lever, E, provided with a roller, E, journaled in its upper end in such a manner that said roller E projects beyond the face of the lever E. In some cases I apply these rollers E as equivalent substitutes for the set-screws g g as pivotal points forthe balance-rynd F.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

Ina millstone-driver, the combination, with 8 5 r the spindle A, bail F, and pivoted yoke C, of

the four levers E, extending above the point of spindle, having end screws, g g, suspending at the lower ends a yoke, D, and arranged one pair upon each side of yoke O, as and for the 0 purpose specified.

JOHN W. DONN EL.

Witnesses:

J. W. WHIFFIN, O. B. MARSHALL. 

